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Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements

There is a wealth of literature on the role of short-range interactions between low-level orientation-tuned filters in the perception of discontinuous contours. However, little is known about how spatial information is integrated across more distant regions of the visual field in the absence of expl...

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Detalles Bibliográficos
Autores principales: Tibber, Marc S., Anderson, Elaine J., Melmoth, Dean R., Rees, Geraint, Morgan, Michael J.
Formato: Texto
Lenguaje:English
Publicado: Public Library of Science 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2642631/
https://www.ncbi.nlm.nih.gov/pubmed/19238207
http://dx.doi.org/10.1371/journal.pone.0004585
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author Tibber, Marc S.
Anderson, Elaine J.
Melmoth, Dean R.
Rees, Geraint
Morgan, Michael J.
author_facet Tibber, Marc S.
Anderson, Elaine J.
Melmoth, Dean R.
Rees, Geraint
Morgan, Michael J.
author_sort Tibber, Marc S.
collection PubMed
description There is a wealth of literature on the role of short-range interactions between low-level orientation-tuned filters in the perception of discontinuous contours. However, little is known about how spatial information is integrated across more distant regions of the visual field in the absence of explicit local orientation cues, a process referred to here as visuospatial interpolation (VSI). To examine the neural correlates of VSI high field functional magnetic resonance imaging was used to study brain activity while observers either judged the alignment of three Gabor patches by a process of interpolation or discriminated the local orientation of the individual patches. Relative to a fixation baseline the two tasks activated a largely over-lapping network of regions within the occipito-temporal, occipito-parietal and frontal cortices. Activated clusters specific to the orientation task (orientation>interpolation) included the caudal intraparietal sulcus, an area whose role in orientation encoding per se has been hotly disputed. Surprisingly, there were few task-specific activations associated with visuospatial interpolation (VSI>orientation) suggesting that largely common cortical loci were activated by the two experimental tasks. These data are consistent with previous studies that suggest higher level grouping processes -putatively involved in VSI- are automatically engaged when the spatial properties of a stimulus (e.g. size, orientation or relative position) are used to make a judgement.
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spelling pubmed-26426312009-02-24 Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements Tibber, Marc S. Anderson, Elaine J. Melmoth, Dean R. Rees, Geraint Morgan, Michael J. PLoS One Research Article There is a wealth of literature on the role of short-range interactions between low-level orientation-tuned filters in the perception of discontinuous contours. However, little is known about how spatial information is integrated across more distant regions of the visual field in the absence of explicit local orientation cues, a process referred to here as visuospatial interpolation (VSI). To examine the neural correlates of VSI high field functional magnetic resonance imaging was used to study brain activity while observers either judged the alignment of three Gabor patches by a process of interpolation or discriminated the local orientation of the individual patches. Relative to a fixation baseline the two tasks activated a largely over-lapping network of regions within the occipito-temporal, occipito-parietal and frontal cortices. Activated clusters specific to the orientation task (orientation>interpolation) included the caudal intraparietal sulcus, an area whose role in orientation encoding per se has been hotly disputed. Surprisingly, there were few task-specific activations associated with visuospatial interpolation (VSI>orientation) suggesting that largely common cortical loci were activated by the two experimental tasks. These data are consistent with previous studies that suggest higher level grouping processes -putatively involved in VSI- are automatically engaged when the spatial properties of a stimulus (e.g. size, orientation or relative position) are used to make a judgement. Public Library of Science 2009-02-24 /pmc/articles/PMC2642631/ /pubmed/19238207 http://dx.doi.org/10.1371/journal.pone.0004585 Text en Tibber et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Tibber, Marc S.
Anderson, Elaine J.
Melmoth, Dean R.
Rees, Geraint
Morgan, Michael J.
Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title_full Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title_fullStr Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title_full_unstemmed Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title_short Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements
title_sort common cortical loci are activated during visuospatial interpolation and orientation discrimination judgements
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2642631/
https://www.ncbi.nlm.nih.gov/pubmed/19238207
http://dx.doi.org/10.1371/journal.pone.0004585
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